Asteroids with Satellites Database--Johnston's Archive
(118303)
1998 UG
compiled by Wm. Robert Johnston
last updated
21 February 2023
--Orbital and physical data--
(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)
dynamical type, primary:
main belt asteroid
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
2.2645942959 AU
| |
orbital period P: |
3.40795472 yr
(= 1244.7554616 d)
| |
eccentricity e: |
0.22945374
| |
perihelion distance q: |
1.744974665 AU
| |
aphelion distance Q: |
2.7842139269 AU
| |
inclination i: |
21.7962006°
| |
argument of perihelion ω: |
119.0190982°
| |
ascending node Ω: |
304.621954°
| |
mean anomaly M: |
32.8307599°
| |
perihelion passage TP: |
2022 Nov 03.482590
| |
Epoch: |
2023 Feb 25
| |
data arc: |
1998-2023
(1883 obs.)
| |
Earth MOID: |
0.84326 AU
| |
Jupiter Tisserand invariant TJ: |
3.49
|
orbital data, secondary:
|
semimajor axis as: |
12
km
[*E]
| |
separation/primary radius as/rp: | 5.8 [*E] | |
separation/Hill radius as/rH: | 0.021 [*E] | |
orbital period Ps: |
1.4871
± 0.0017
d [B23g]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13.96
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
4.28
± 0.21
km [M**]
| |
geometric albedo: |
0.384
± 0.047
[M**]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
560 km [*E]
|
other data, primary:
|
diameter dp: |
<4.12
± 0.20
km [*D]
| |
rotation period RPp: |
3.3545
± 0.0003
h [B23g]
| |
amplitude in mag., rotational ΔM: |
0.11
[B23g]
| |
amplitude in mag., mutual events ΔM: | 0.08 [B23g] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
>1.15
km [*D]
| |
diameter ratio ds/dp: |
>0.28
[B23g]
| |
component mag. difference ΔM: |
<2.8
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(118303) 1998 UG
--discovery and notes:
Primary discovered
1998 Oct 17
from
Catalina Station, Arizona, USA
by
Catalina Sky Survey.
Alternate designation(s):
2001 OD14.
Permanent number assigned 2005 Nov 16.
Companion discovered
2022 Nov 29
by V. Benishek and P. Pravec
using
lightcurve
observations from Sopot Observatory, Serbia.
Announced
2023 Feb 20 [B23g].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2023
by Wm. Robert Johnston.
Last modified
21 February 2023.
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